A Christmas party was a party held to celebrate Christmas. The Twelfth Doctor suggested embarrasing footage of the Mire being defeated would be played every year at the Christmas party. (TV: The Girl Who Died)
UNIT often held Christmas parties. One year, the Third Doctor used a vortex as a locale for the annual party. (PROSE: UNIT Christmas Parties: First Christmas) Another year, the Master infiltrated the party using the alias Aloysius Fischer. (PROSE: UNIT Christmas Parties: Christmas Truce) At yet another Christmas party, a Voddod warrior ship crashed into the party, trapping Sarah Jane Smith and Harry Sullivan under rubble. (PROSE: UNIT Christmas Parties: Ships That Pass)
Following the deaths of Toshiko Sato and Owen Harper, Torchwood Cardiff held a Christmas party which was infiltrated by Drahvins posing as waitresses. As Gwen Cooper recalled, the party turned into a siege once they were outed. (AUDIO: Dissected)